William Gray appeals the district court's denial of his petition for a writ of habeas corpus. The petitioner contends that 18 U.S.C. § 4210(b) (1) (1980) is applicable not only to those considered parolees by virtue of their mandatory release, but also to those granted parole. The district court properly concluded that § 4210(b) (1) applies only to those on mandatory release and, thus, the respondent had jurisdiction over the petitioner on March 14, 1980.